divide (am²+bm²-bn²-an²)÷(m+n)
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am²+bm²-bn²-an²÷m+n
a(m+n)(m+n)+b²(m²-n²) ÷m+n
a(m+n)(m-n)+b(m+n)(m-n)÷m+n)÷m+n
a(m-n)+b(m-n)
(a+b)(m-n)
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